If you stand on the edge of a block and throw something along the edge, whatever is thrown will slide along it until the item either falls off, or slides far enough to get stuck on top of the block. Is the bug reproducible? How can you reproduce the bug? See here: https://www.youtube.com/watch?v=YUf...

Here's a silly idea. Would it be possible to expand the mod to add multiple layers of bedrock? I believe there are no plans to add multiple dimensions to the game though perhaps this could be fixed, at least partially, by 'layering' the underground. You'd be limited to cave-like areas obviously but....